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प्रश्न
Distinguish between Nonchordata and Chordata.
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उत्तर
| Nonchordates | Chordates |
| 1. Notochord is absent in them | 1. Notochord is present in them at some of their developmental stage. |
| 2. Their central nervous system is solid and ventral | 2. Their central nervous system is hollow and dorsal. |
| 3. Heart, if present in them, is dorsal in position. | 3. Heart is always present and it is ventral in position. |
| 4. Their circulatory system is of open or closed type. | 4. Their circulatory system is of closed type. |
| 5. Respiratory pigment, the haemoglobin, if present, is dissolved in plasma of blood. | 5. Haemoglobin is present in their red blood cells or corpuscles. |
| 6. Pharyngeal gill slits are absent in them. | 6. Pharyngeal gill-slits are present in them. |
| 7. They contain anus at posterior end of body, so post-anal tail is not present. | 7. Their anus is not located at posterior tip of body, so contain a post-anal tail. |
संबंधित प्रश्न
Match the following:
| Column I | Column II | ||
| (a) | Operculum | (i) | Ctenophora |
| (b) | Parapodia | (ii) | Mollusca |
| (c) | Scales | (iii) | Porifera |
| (d) | Comb plates | (iv) | Reptilia |
| (e) | Radula | (v) | Annelida |
| (f) | Hairs | (vi) | Cyclostomata and Chondrichthyes |
| (g) | Choanocytes | (vii) | Mammalia |
| (h) | Gill slits | (viii) | Osteichthyes |
Write down four characteristics of Ctenophora.
What do you mean by the term triploblastic animals?
Give one point of difference between notochord and nerve cord.
How do animals of Porifera differ from animals of Cnidaria?
Write down four general characters of cnidarians (coelenterates).
Explain the general charaters of phylum Mollusca.
What are the group names of the following categories of animals?
Animals with feathers _________
Given below is an animal followed by three terms or features. Underline the term which does not match with the animal.
Earthworm - Invertebrata, Annelida, Insecta
Give four important characters of mammals.
Write two main characters of the following animal and name the phylum it belongs to: Whale
Write the name of a mammal who lives in water.
Write name of any poikilothermic animal.
Give two examples of each of the following: Arthropoda
Fill in the blanks:
The excretory organs of platyhelminthes are ______.
Fill in the blanks:
Bath sponge belongs to phylum ______.
Choose the correct answer: The animal of phylum protozoa is
The binomial name of onion is ______.
